I use hot BLC in the hand pump tap cleaner system like mentioned above, every time I switch kegs. I don't really have an issue with it, I follow the directions where you are supposed to wedge a brush in the end of the line to put back pressure on the line, and give it a few pumps and come back later. This also allows time for the faucets to soak after being completely disassembled. You should ALWAYS disassemble and clean your faucets, this is going to be the area where you have the most chance of nasty buildup. Afterwards, I rinse the lines very thoroughly with clean, hot water and reassemble. I've never used sanitizer after that, and I've never had an issue, but I guess I can see the merit of it, especially if it's going to be a while until you use the lines again.
Also, sanitizer will not clean your beer lines. BLC is your best bet if you want to remove deposits on the lines. If you are worried about sanitization of the lines, your beer is going one direction through the lines, so there's no reason to have to sanitize if everything before it has been in a controlled environment.